Chapter 5, Problem 64E

Calculate $\Delta H_{298}^{°}$ for the process $\text{Zn}\left(s\right)+\text{S}\left(s\right)+2{\text{O}}_2\left(g\right)\to {\text{ZnSO}}_4\left(s\right)$ from the following information:

$\begin{array}{l}\text{Zn}\left(s\right)+\text{S}\left(s\right)\to \text{ZnS}\left(s\right)\Delta H_{298}^{°}=-206.0\text{kJ}\\ \text{ZnS}\left(s\right)+2{\text{O}}_2\left(g\right)\to {\text{ZnSO}}_4\left(s\right)\Delta H_{298}^{°}=-776.8\text{kJ}\end{array}$